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A gazillion normally refers to an indefinitely large quantity, like a zillion. However, some people have given definite values to this name.

## Calvin and Hobbes definition

This definition comes from the following Calvin and Hobbes comic strip:

Calvin: Psst! Susie, what's 7 + 6?
Susie: Three hundred billion gazillion.
Calvin: Oh, thanks for the big help!
Susie: That's a three, followed by 85 zeroes.
Calvin: Ah! I knew that.

Since 300 billion gazillion is equal to $$3 \cdot 10^{85}$$, a gazillion would then be equal to $$10^{74}$$, or one hundred trevigintillion.[1][2] If you use the long scale, a gazillion is equal to $$10^{71}$$.

Cookiefonster calls 300 billion gazillion = $$3 \cdot 10^{85}$$ the "Calvin and Hobbes number".[2]

## Greg Clarke's definition

Greg Clarke defined gazillion as 1086,340.[3]

## Approximations

For the Calvin and Hobbes definition:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{74}$$
Arrow notation $$10\uparrow74$$
Steinhaus-Moser Notation 44[3] 45[3]
Copy notation 9[74] 1[75]
Taro's multivariable Ackermann function A(3,242) A(3,243)
Pound-Star Notation #*(7,16,5,1)*16 #*(2,3,2,0,2,4)*8
BEAF {10,74}
Hyper-E notation E74
Bashicu matrix system (0)(0)(0)(0)[42169] (0)(0)(0)(0)[42170]
Hyperfactorial array notation 55! 56!
Fast-growing hierarchy $$f_2(237)$$ $$f_2(238)$$
Hardy hierarchy $$H_{\omega^2}(237)$$ $$H_{\omega^2}(238)$$
Slow-growing hierarchy $$g_{\omega^{\omega7+4}}(10)$$